The cheapest white Macbook currently available will be more than enough. Macbook's Intel architecture is superb and of high-quality; it'll offer her more than enough juice to run all of her software. If she will be using things like MS Access which is only available through Windows, she can run a small partition of Windows on it as well to seamlessly continue her work. And.. you actually get someone that understands you well on the phone when you call 1-800-MY-APPLE. (No more repeating your creditcard numbers... haha!)

I am actually a marketing agent for Apple on campus for a college in the Northeast region. If you want more help, feel free to post back here! I can go over the usual requirements if you can tell me a little more about what kind of degree she'll be pursuing in her grad school.

I should also be able to forward her directly to her school's campus rep to assist her in person or via email on any pre-purchase issues!